I dont think the breed really has big combs, mine dont. It doesnt mean theyre not healthy or anything, its just genetics. Only the roosters have huge combs, but the hens are pretty small. Shes not gonna have the comb of a leghorn hen is what Im saying. Ug, im sorry, lol. Its early. Tell me if this is making sense.
My four BA girls are 13 weeks and look just like your pic, except that their combs/faces are redder. Like another poster said, their combs just don't get all that big, but they will get bigger than what yours is now.